How steep, are you calling steep?
I have a 30 ft or so section of 30° to 40° slope. I made tiers
detailed here. Spoiler, it's done with wattles. These break down faster than I expected. If you choose tiers, it may be best for you to make the walls of tiers with a more durable product.
Tiers do make it easier to not trip and roll down the 'hill'. At 59, I am now thinking on making steps of some sort.between my sets of tiers. Before I can't do any earth moving myself.